# Designing a Concert Ticket Booking System In this article, we delve into the object-oriented design and implementation of a Concert Ticket Booking System using Java. This system facilitates booking tickets for concerts and managing events. ## System Requirements The Concert Ticket Booking System should: 1. **Event Management**: Manage concert details including dates, venues, and artists. 2. **User Account Management**: Handle user registrations and profiles. 3. **Ticket Booking Process**: Enable users to book tickets and select seats. 4. **Payment Processing**: Handle ticket payments and issue receipts. 5. **Ticket Cancellation and Refund**: Manage cancellations and refunds. ## Core Use Cases 1. **Creating and Managing Concert Events** 2. **Registering and Managing User Accounts** 3. **Booking and Canceling Tickets** 4. **Processing Payments and Issuing Tickets** 5. **Handling Refunds** ## UML/Class Diagrams Key Classes: - `ConcertTicketBookingSystem`: Manages the system. - `User`: Represents a customer. - `Concert`: Represents a concert event. - `Ticket`: Manages ticket details. - `Payment`: Handles payment transactions. ## Java Implementation ### Concert Class Represents a concert event. ```java import java.util.Date; public class Concert { private String concertId; private String title; private Date date; private String venue; private int totalSeats; private int availableSeats; public Concert(String concertId, String title, Date date, String venue, int totalSeats) { this.concertId = concertId; this.title = title; this.date = date; this.venue = venue; this.totalSeats = totalSeats; this.availableSeats = totalSeats; } public boolean bookSeats(int numberOfSeats) { if (numberOfSeats <= availableSeats) { availableSeats -= numberOfSeats; return true; } return false; } // Getters and setters... } ``` ### User Class Manages user account information. ```java public class User { private String userId; private String name; private String email; public User(String userId, String name, String email) { this.userId = userId; this.name = name; this.email = email; } // Getters and setters... } ``` ### Ticket Class Represents a concert ticket. ```java public class Ticket { private String ticketId; private Concert concert; private User user; private int numberOfSeats; private double totalPrice; public Ticket(String ticketId, Concert concert, User user, int numberOfSeats, double pricePerSeat) { this.ticketId = ticketId; this.concert = concert; this.user = user; this.numberOfSeats = numberOfSeats; this.totalPrice = pricePerSeat * numberOfSeats; } // Getters and setters... } ``` ### Payment Class Handles payment transactions. ```java public class Payment { private String paymentId; private double amount; private PaymentStatus status; public Payment(String paymentId, double amount) { this.paymentId = paymentId; this.amount = amount; this.status = PaymentStatus.PENDING; } public void completePayment() { this.status = PaymentStatus.COMPLETED; } // Getters and setters... } enum PaymentStatus { PENDING, COMPLETED, FAILED } ``` ### ConcertTicketBookingSystem Class Manages the concert ticket booking system operations. ```java import java.util.ArrayList; import java.util.List; public class ConcertTicketBookingSystem { private List<User> users; private List<Concert> concerts; private List<Ticket> tickets; public ConcertTicketBookingSystem() { this.users = new ArrayList<>(); this.concerts = new ArrayList<>(); this.tickets = new ArrayList<>(); } public void addUser(User user) { users.add(user); } public void addConcert(Concert concert) { concerts.add(concert); } public Ticket bookTicket(String userId, String concertId, int numberOfSeats) { User user = findUserById(userId); Concert concert = findConcertById(concertId); if (user != null && concert != null && concert.bookSeats(numberOfSeats)) { double pricePerSeat = // Assume a method to get price per seat Ticket ticket = new Ticket(generateTicketId(), concert, user, numberOfSeats, pricePerSeat); tickets.add(ticket); return ticket; } return null; } private User findUserById(String userId) { for (User user : users) { if (user.getUserId().equals(userId)) { return user; } } return null; } private Concert findConcertById(String concertId) { for (Concert concert : concerts) { if (concert.getConcertId().equals(concertId)) { return concert; } } return null; } private String generateTicketId() { return "TICKET_" + System.currentTimeMillis(); } // Other necessary methods... } ```